-------------------- Helpers -------------------- */ IsRequestGRPC checks the true if the request is a gRPC request by checking the protocol and content type.

NewGRPCServer creates a new grpcServer instance using the provided AuthDataSource.

AuthDataSource is an interface that abstracts the data source.

CapacityLimitPeriod is a string type representing the capacity limit period for a gateway endpoint, which maps to the CapacityLimitPeriod enum in the proto package.